I went ahead and add 50 mL of DI water to the solution to dilute it down, and it all dissolved. Does this mean that my solution is still 10% concentration? Or given the solubility, is it actually at 9% concentration?

I went ahead and add 50 mL of DI water to the solution to dilute it down, and it all dissolved. Does this mean that my solution is still 10% concentration? Or given the solubility, is it actually at 9% concentration?

You added 50ml to what?WHat is your endvolume now?10grams in 100ml or?

If you don't know it, then ask it! Better to ask and look foolish to some than not ask and stay stupid.

But not if only 9g are soluble in 100 mL....at room temperature there should be a precipitate visible of the remaining gram.

One must presume that long and short arguments contribute to the same end. - Epicurus...except casandra's that did belong to the funniest, most interesting and imaginative (or over-imaginative?) ones, I suppose.